Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hang tai » hang va, dung tai
hanh tai » thanh tai, han tai, hinh tai
than luc » nhan luc, than duc, thanh luu
hieu van » hieu va, thien van, lieu va
van than » van thanh, van thang, van tuan
dang xay » dang van, van xay
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
tu sach » thu sach, su sach, te sach
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky ((nang xa) or (dang xay)) hoi. hieu van than luc va ((hanh tai) or (hang tai)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (dang xay)) hoi. hieu van than luc va ((hanh tai) OR (hang tai)) su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((nang xa) or (dang xay)) hoi. hieu van than luc va ((hanh tai) or (hang tai)) su triet*.